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Mathematical sequence problem
The sum of 1-8 is 36 and the sum of four triangles is 13X4=52.

The difference between them is the sum of the middle four numbers 52-36= 16.

The middle four numbers require that the sum of any two numbers is not more than 13 and not less than 5, and a group can be obtained: 2 3 4 6, so the complete number is:

8 1 7

4 5

3 6 2